I too am working on an AR build right now. Parts I still need are: buffer tube assembly, bolt, dust cover and some iron sights. I was lucky to have a Colt 20" 1/7 Nato barrel a bolt carrier and a few other parts lying around, so I built it around the barrel.
I but punches at Harbor Freight - they have worked fine. I did (over-pay) for a good AR's armorer tool; I can't see doing a built without one.
What bugs me is that I had a spare buffer tube laying around, but I can't find it anywhere. You can find they pretty cheap, but if you want a mil spec made out of 7075, those are ridiculously priced right now.